Stanford-CoreNLP在线程上运行后不会清空内存

Question

While running Stanford CoreNLP on my system it doesn't seem to empty the memory. Even when using Threads...
I have 2 classes Testx.java (Contains main thread) & Testx2.java which implements Runnable.

What I would like to do is to empty the memory completely after running the Stanford CoreNLP on String no. 1 as shown in the code below...

And I know it can be done! Because I have seen the Memory usage dip while working on it before(But I didn't keep a back up of that code! :/)
VM Arguments is -Xmx2048m

public class Testx {
    public static void main(String[] args) {

    String text = "If you had to guess the top city for entertainment & media your first thought would probably be LA.";

    Textx2 x = new Textx2(text);
    Thread t1 = new Thread(x);  
    t1.run();
    t1.interrupt();

Memory usage after t1 has finished
// How do I Completely empty the Memory Here before moving on to the next String?

    String text2 = "Taylor Swift has a certain attachment to the number 1989 it's the year of her birth.";

    Textx2 x2 = new Textx2(text2);
    Thread t2 = new Thread(x2);  
    t2.run();
    t2.interrupt();
}

Testx2.java Code.

String text;

public Textx2(String text) {
    this.text = text;
}

@Override
public void run() {

            Properties props = new Properties();
            Annotation document = new Annotation(text);
            props.put("annotators", "tokenize, ssplit, pos, lemma, ner, parse, depparse, sentiment, mention, dcoref, natlog, relation, entitymentions, openie");
            StanfordCoreNLP pipeline = new StanfordCoreNLP(props);
            pipeline.annotate(document);

}

java memory usage

Answer 1

在两个线程都完成之后，尝试运行此行：

StanfordCoreNLP.clearAnnotatorPool();